add a replacement API for PyCObject, PyCapsule #5630

All stdlib modules with C-APIs now use this.

Patch by Larry Hastings
diff --git a/Include/ucnhash.h b/Include/ucnhash.h
index 6231c98..69b7774 100644
--- a/Include/ucnhash.h
+++ b/Include/ucnhash.h
@@ -6,7 +6,9 @@
 extern "C" {
 #endif
 
-/* revised ucnhash CAPI interface (exported through a PyCObject) */
+/* revised ucnhash CAPI interface (exported through a "wrapper") */
+
+#define PyUnicodeData_CAPSULE_NAME "unicodedata.ucnhash_CAPI"
 
 typedef struct {